Fluid-pressure motor



F. A. ENGH. FLUID PRESSURE MOTOR.

APPLICATION FILED IAN.1 5, 1919- Patented Apr 5, 1921.

UNITED STATES FRED A. ENGH, OF JOHNSTOWN, PENNSYLVANIA. v

FLUID-PRESSURE Moron.l

Specication of Letters Patent.

Patented Apr.f5, 19251.

Application led January 15, 1919. Serial No. 271,324.

To all lwhom t may concern.: f

Be it known that I, FRED A. ENGH, a citizen of the United States, residing in the city of Johnstown, in the county ofv Cambria and State of Pennsylvania, have invented certain new and useful limprovements in Fluid-Pressure Motors; and I do hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to improvements in fluidpressure motors with special reference to those of the rotary type provided with a shaft having movable blades located diametrically in a slot therein, said shaft being located eccentrically within a cylindrical opening, against the inner sides of which the blades are adapted to contact.

Fluid under pressure is introduced through entrance vports against one side of the blades causing them and thek shaft to rotate, and after a partial revolution is exhausted through suitable exhaust ports and as the operation continues the shaft is rotated with considerable power and velocity.

My motor is shown as adapted to be used in connection with a boiler tube cleaner tool but it will be understood that it may be used for any other apparatus for which it ma be suited.

avingthus given a general'description of my invention, I will now, in order to niake the matter more clear, refer-to the annexed sheet of drawings which forms part of this specification and in which like characters of reference refer to like parts Figure 1 is a vertical sectional elevation of my improved motor taken on the line I-I of Fig. 7 showing the flue cleaner tool attached thereto. Fig. 2 is a side elevation of the shaftv with the blades or paddles inserted therein. Fig. 3 is a vertical sectional elevation of the motor casing taken on the line lll-III of Fig. 7. Fig. 4 is a plan view of the bushing for the lower end of the shaft. Fig. 5 is a transverse sectional elevation taken on the line V-V of Fig. 1. Fig. 6 is ka transverse sectional elevation taken on the line VI-Vlof Fig. 1. Fig. 7 is a transverse sectional elevation taken on the line VII-VII of Fig. 1. Fig. 8 is a transverse sectional elevation taken on the line VIII-VIII of Fig. 1. Fig. 9 is a detail of the lower end of the operating shaft and eccentric bushing with a curved fillet; and Fig. 10. is a view of the same with a beveled connection between the" large and small portions of the shaft.

Referring now'to the characters of reference on the drawings z-l is the casing which is generally 'of compact cylindrical form, as illustrated, 2 is the cylindrical fluid-pressure or operating chamber eccentrically lo cated, 3 is a main inlet port extending longitudinally of the casing, connecting with the interior of the upper end thereof and adapted to receive fluid under pressure, which may be supplied by a pipe or hose connected to the internally screw-threaded end 16y fitted into the casing, 4 are a number of cross ports connected with the main port 3 and opening into the fluidpressure chamber 2, as illustrated. 5 is the main exhaust port extending longitudinally of the casing, as shown, 6 are the cross ports connecting the fluid pressure chamber with the main exhaust port 5, which latter opens to the outer atmosphere and is adapted to discharge the fluid which has been utilized therein. 7 is a bushing adapted to serve as a bearing for the lower end 26 of the shaft 20 and also as a thrust bearing Vfor the shaft, this bushing being provided with an eccentric flange 8, which flange is constructed and adaptedto form the end of,` and the closure for the-lower end of the `iuid pressure chamber 2, and the seat therefor is of such form that i-'t'can be readily shaped by drilling or reaming the bottom portion of said chamber, while the lower part of the bushing 7 is similarly cylindrical and adapted to closely lit into the lower end of the casing, as illustrated. The bushing 7 is provided with a groove 9 of-approximately semicircular form and the adjacent portion of the casing also has a groove of the same shape opposite thereto to receive the pin 10, which holds the bushing in place and prevents the displacement or rotation of sameand also` allows the bushing withy the flange to be removed in case of wear, and a new bushing inserted in place thereof. The upper end of the shaft is journaled in the bushing 11, which, as illustrated7 is formed of a simple disk approximately circular in form, with the exception that it has openings therein to allow the entrance of fluid under pressure into thev inlet port 3, andis also provided with a notch 14, in which is inserted a pin 15 to hold it in its proper position so that the opening in the same registers with the inlet opening of the port 3. The disk or. bushing 11 is also provided with a cylindrical opening 12, in which the upper reduced end 25 lof the shaft 20 is journaled. The disk 11 is also provided with an opening 13 to allow fluid under pressure to enter `the inlet port 3. The

upper end of the motor casing s provided with an externally threaded screw cap 16 which is adapted to lit in the internal thread of the casing and is also provided with an internally threaded opening to receive the end of a pipe or hose coupling adapted to supply fluid under pressure tothe apparatus. The upper end of the motor is provided with a recess or admission chamber 17 to which iiuid under pressure is first admitted and connecting therewith is a cutout portion or notch 18 on one side of the screw kcap to allow free passage of the fluid to the inlet Iport. The casing is provided with an internal seat 19 adapted to receive the disk 11` and .to form a closure therewith. The shaft 2O is provided with a s lot 21, the ends of which and particularly the lower end, it will be noted, are removed certain distances from the shoulder in order to give the shaft greater strengthfby not cutting away its largest diameter, and the junction of the reduced ends of the `shaft with the larger body portion are vmade with considera-ble fillets, curves or bevels, in order that the upper surface of 'the eccentric flange 8 and the lower surface of the disk 11 may contact with the ends of the blades, thus obviating any leakage Aat `the ends thereof, while the construction of the shaft thus provides much greater strength than if the slot therein extended `to the reduced end portions. The ends of theslot are also rounded in order to obviate the use `of square cornered openings, which,y in themselves, are a source of weakness, and by reason of this construction my shaft is very much stronger and better adapted for service than the ones customarily in use.

The paddles or blades of the apparatus are 22, each provided with a thickened and rounded end 23, the outer portions of which are adapted to contact with the inner'surface of the eccentrically located cylindrical opening or Huid-pressure chamber 2 in the casing, and as illustrated in Fig.v 2 the curved connecting portion between the reduced end of the shaft and the largerbody portion, as above referred to, is24, and the upper reduced end of the shaft forming the top journal thereof is 25. The lower outer end of the shaft is threaded, as illustrated, at 27 and adapted to receive an internally threaded eye-bolt 28, which in turn is connected to asimilar eye-bolt end 29 of the Hue cleaner head 30, thereby forming a universal joint.

It should also be noted that the outer edge of the slot in the shaft is beveled, as illustrated, at 31, in orderto more fully protect the ends of the blades and allow them to function I`properlywhile 32 is the rounded yby a beveled portion 35'which fits against vthe, correspondingly beveled portion 36 of the eccentric-flange 8 of the bushing 7, all of these constructions, including that shown in Figs. 1, 9 and 10, serving as thrust bearings 'for the `shaft 20, and the curved or beveled connection between the two shafts serves to strengthenI the junction, particularly on account of the slot 21 which would otherwise 4weaken the shaft.

On account of the fact that `iiuid pressure is applied to the upper end of the shaft and notte the lowerend, this has a tendency vto cause the shaftto press somewhat against the lower end of the apparatus so that the eccentric `bushing `7 serves, in a measure, as a thrust bearing and the rounded fillet of same coperating with the similarly rounded junction between the smaller portion vof the shaft and the larger body coperates with this and together resist the thrust. Y

The operation of my motor is as follows: Fluid under pressure is introduced from a hose or pipe` connected with externally screw-threaded opening in the cap 16, en-

ters the admission chamber 17, vthence into the main inlet port 3, then through the cross ports L into the cylindrical fluid-pressure chamber 2, where the pressure acts upon the projecting ends of the paddle blades .22 Vand llO causes them to rotate, thereby rotating the shaft 2O and its connections, the ends of the paddles, 22 meanwhile contacting with the inner cylindrical surface of the fluid-pressure chamber 2, and` after Va paddle has passed the cross ports l6 the iiuid .is then eX- hausted into the exhaust port 5 and is discharged intotheouter air, and as the paddles and shaft rotate, this operation is continuous. As compared with prior motors of this general type, my apparatus is of very simple construction, composed ofV few parts, all of which are easily manufactured and their arrangement is such vthat the mechanical operations to form them are the simplest possible, all conducing tovease of con--` struction, operationv and maintenance.,

Although I have described and illustrated my invention in considerable detail, I do not wish to be limited to the exact and specific details thereof, as shown and described, but may use such modifications in, substitutions for, or equivalents thereof, as are embraced within the scope of my invention, or as pointed out in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. In a motor of the class described a casing, a cylindrical fluid pressure chamber eccentricall-y located therein, a revoluble shaft with reduced end portions mounted therein, a rear bearing therefor comprising a disk seated within the chamber, serving as a closure for the portion therebelow, a central perforation in said disk in which the rear reduced end of the revoluble shaft is journaled and exposed to the incoming fluid pressure, and a forward bearing comprising an eccentric bushing provided with a flange concentric with the fluid pressure chamber.

2. In a motor of the class described, a casing, a cylindrical fluid pressure chamber eccentrically located therein, a revoluble shaft with reduced end portionsv mounted therein, a rear bearing therefor comprising a disk seated within the chamber and together with the shaft end serving as a closure for the portion therebelow, a central perforation in said disk in which the rear reduced end of the revoluble shaft is journaled and exposed to the incoming fluid pressure, and a front bearing for the reduced forward end of the' revoluble shaft comprising a bushing mounted within the motor casing and provided with an integral eccentric flanged edge concentric with the fluid pressure chamber and forming the entire head of the fluid pressure chamber.

3. In a rotary motor, a casing, a cylindrical fluid pressure chamber e'ccentrically located therein, a revoluble shaft with reduced end portions mounted in said chamber, the rear bearing therefor comprising a disk seated within the casing, and exposed to the incoming fluid pressure and together with the shaft end forming a closure for the working chamber, a central perforation in said disk in which the rear reduced end of the revoluble shaft is journaled, a front bearing for the reduced forward end of the revoluble shaft comprising a bushing concentrically mounted within the motor casing and provided with an integral eccentric flanged edge concentric with the fluid pressure chamber and forming the entire head of the fluid pressure chamber, a convex bearing surface'formed around the inner edge of the bushing, and a bearing surface formed on the revoluble shaft for engaging the convex bearing surface of the inner edge of the bushing.

4. In a rotary motor, a, casing, a cylindrical fluid pressure chamber eccentrically located therein, a revoluble shaft with reduced end portions mounted therein, the rear bearing comprising a disk seated within the casing, a central perforation in said disk in which the rear reduced end of the revoluble shaft is journaled, said disk and shaft end being exposed to the incoming fluid, a front bearing for the forward end of the revoluble shaft, comprising a bushing concentrically mounted within the front end of the motor casing and provided with an integral eccentric flanged edge concentric with the fluid pressure chamber and forming the a rounded or convex bearing surface formed around the inner edge of the bushing, a rounded or convex bearing surface formed on the revoluble shaft adapted to engage the convex or rounded bearing surface around the inner edge of the bushing, and a removable pin for retaining the flanged bushing in place whereby the said flanged bushing may be removed at will.

5. A rotary motor, comprising a casing, a cylindrical fluid pressure chamber eccentrically located therein, a revoluble shaft with reduced end portions mounted therein, the larger central portion of the revoluble shaft being formed with a diametrical slot therethrough withv rounded ends, paddles or blades seated in the diametrical slot having rounded outer edges and ends, a bearing for the rear reduced end of the revoluble shaft comprising a disk seated within the casing, a central perforation in said disk in which the rear reduced end of the revoluble shaft is journaled, said disk and shaft end being adapted to receive the thrust of the incoming fluid pressure, a bearing for the forward end of the revoluble shaft, comprising a bushing concentrically mounted within the front end of the motor casing and providedy with an integral eccentric flanged edge concentric with the fluid pressure chamber and forming the entire head of the fluid pressure chamber, a rounded or convex bearing surface formed around the inner edge of the bushing, a rounded or convex bearing surface formed on the revoluble shaft adapted to engage the convex or rounded bearingk surface around the inner edge of the bushing, and a removable pin adapted to retain the flanged bushing.

In witness whereof I hereunto affix my signature.

FRED A. ENGH.

entire head of the fluid pressure chamber, 

